Do Now On the new tracker! 1. List the organelles that all cells have. 2. What is the function of the nucleus? 3. Looking through a microscope you identify a plant cell. How do you know? 4. Why is the mitochondria the “powerhouse” of the cell? 5. Since Claudel is a Eukaryotic animal cell, what makes Claudel different from plant cells? Do Now On the new tracker! All bacteria are examples of what type of cell? what are the three C’s unique to plants? Where is DNA stored? What organelle is responsible for building protein? Big Goal?

Verbal Drills All bacteria are examples of what type of cell? What are the three C’s unique to plants? Where is DNA stored? What organelle is responsible for building protein? Class Motto?

Cell Membrane SC.912.L.14.2 Relate structure to function for the components of plant and animal cells. Explain the role of cell membranes as a highly selective barrier (passive and active transport)

Cell Membrane Objective: Describe the structure of the cell membrane and explain how it contributes to its function EQ: How do materials pass through the cell membrane?

Turn and Talk You’re one of the main characters in The Walking Dead zombie apocalypse. You’re trying to find somewhere protected to stay long-term. What are some things you’d need to consider about the type of protection you need?

Cell Membrane Structre Cell membranes are made of phospholipids, a type of lipid that has a polar phosphate head and two fatty acid tails Which part of this molecule would be attracted to water? Why?

Cell Membrane: Structure Phosphate Head Fatty Acid Tails The polar phosphate head is hydrophilic (water loving) the tails are nonpolar and hydrophobic (water hating). What does it mean to be polar? Which part of the phospholipid would be on the outside?

Check for Understanding Why is the arrangement of phospholipids in the membrane called a bilayer? The prefix bi means two; since there are two layers of phospholipids, it is called a bilayer

Cell Membrane Structure The phospholipids form a bilayer with the hydrophobic tails inside, protected from the water

Stop and think Think about the structure of the CM, what material do you think will pass through easily? Why?

Selective Permeability Cell membranes are selectively permeable, some materials can pass through the membrane while others cannot

Brainstorm: You’re on a road trip, and you come across a mountain. There’s no way around the mountain, and your destination is on the other side. How do you get there?

Brainstorm: You could try to climb the mountain, but that would take a lot of TIME and ENERGY. It would be much easier if there was a tunnel that could provide a path for you! Just like a tunnel through a mountain, passages in the cell membrane make it easier for materials to pass through to the other side!

Parts of the Membrane the cell membrane also contains proteins, carbohydrates, and cholesterol All of the molecules are in constant motion, sliding past one another. This is called the fluid mosaic model. cell membrane protein cholesterol carbohydrate chain protein channel

Fluid Mosaic Model https://www.youtube.com/watch?v=Qqsf_UJcfBc

Parts of the Membrane: Channel Protein provide places for molecules to move across the membrane (either into or out of the cell) Ex: Like tunnels/ channels

Parts of Cell Membrane: Cholesterol helps provide strength to the cell membrane Ex: structural support

Parts of Cell Membrane: Carbohydrates help identify and distinguish the cell from other types of cells Ex: state flags in the U.S.

Parts of Cell Membrane: Phospholipid creates barrier around cell with the hydrophobic tails facing in and the hydrophilic heads facing out Ex: security

REVIEW: WHAT IS…. The structure of the cell membrane? Of Phospholipids? Of Channel Protein? Of Cholesterol?

Cell Membrane: Function There are two main functions of the cell membrane: Protects from outside environment - forms boundary between the inside and outside of the cell Controls what enters and exits the cell – because it is semi-permeable

Think-Pair- Share For two minutes, discuss the following question with your table partner. Be ready to share your answer! Why might it be important for a cell to regulate the materials moving into and out of it?

Think, Pair, Share Why might it be important for a cell to regulate the materials moving into and out of it? Conditions outside the cell are constantly changing. However, a cell must maintain homeostasis to carry out its functions. To do this, it must be able to control the movement of particular molecules across the cell membrane.

H- work with your partner Build a Membrane C – level 2 voice H- work with your partner A- build a model membrane out of the materials provided M- remain seated in your assigned seat P- complete your activity sheet with justrifications Success! Working with a partner, build a membrane out of the materials provided.

Exit Ticket Clear you desk of everything except something to write with!

Exit 1 Look at the cell membrane model. What is the name of the macromolecule that makes up the majority of the cell membrane? A. nucleotide B. lipid C. carbohydrate D. protein

Exit 2 The cell membrane of the red blood cell will allow water, oxygen, and carbon dioxide to pass through. Because other substances are blocked from entering, this membrane is called A. perforated B. semi-permeable C. non-conductive D. permeable

Exit 3 The cell membrane is made of a phospholipid bilayer. The structure of the cell membrane is important to its ability to control what comes in and out. Due the membrane being semi-permeable, some molecules can easily pass through while others cannot. What is the structure of the phospholipid bilayer? A. The hydrophobic heads are on the outside and the hydrophilic tails are on the inside. B. The hydrophilic heads are on the outside and the hydrophobic tails are on the inside. C. The nonpolar heads are on the inside and the polar tails are on the outside D. The polar heads are on the inside and the nonpolar tails are on the outside.

Exit 4 Which statement regarding the functioning of the cell membrane of all organisms is not correct? A. The cell membrane forms a boundary that separates the cellular contents from the outside environment. B. The cell membrane is capable of receiving and recognizing chemical signals. C. The cell membrane forms a barrier that keeps all substances that might harm the cell from entering the cell. D. The cell membrane controls the movement of materials into or out of the cell